"Chainloading" grub-efi from grub-pc?

I recently compiled grub for an efi platform and put it in the EFI partition of a MacBookPro 6,2. On this mac I have a triple boot system with Os X, Ubuntu and Windows. I was wondering whether I could "chainload" the grub-efi I put in EFI partition from grub-pc, which I installed in the Ubuntu partition? Many thanks!